File: spec_content_type.rb

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# frozen_string_literal: true

require 'minitest/global_expectations/autorun'
require 'rack/content_type'
require 'rack/lint'
require 'rack/mock'

describe Rack::ContentType do
  def content_type(app, *args)
    Rack::Lint.new Rack::ContentType.new(app, *args)
  end

  def request
    Rack::MockRequest.env_for
  end

  it "set Content-Type to default text/html if none is set" do
    app = lambda { |env| [200, {}, "Hello, World!"] }
    headers = content_type(app).call(request)[1]
    headers['Content-Type'].must_equal 'text/html'
  end

  it "set Content-Type to chosen default if none is set" do
    app = lambda { |env| [200, {}, "Hello, World!"] }
    headers =
      content_type(app, 'application/octet-stream').call(request)[1]
    headers['Content-Type'].must_equal 'application/octet-stream'
  end

  it "not change Content-Type if it is already set" do
    app = lambda { |env| [200, { 'Content-Type' => 'foo/bar' }, "Hello, World!"] }
    headers = content_type(app).call(request)[1]
    headers['Content-Type'].must_equal 'foo/bar'
  end

  it "detect Content-Type case insensitive" do
    app = lambda { |env| [200, { 'CONTENT-Type' => 'foo/bar' }, "Hello, World!"] }
    headers = content_type(app).call(request)[1]
    headers.to_a.select { |k, v| k.downcase == "content-type" }.
      must_equal [["CONTENT-Type", "foo/bar"]]
  end

  [100, 204, 304].each do |code|
    it "not set Content-Type on #{code} responses" do
      app = lambda { |env| [code, {}, []] }
      response = content_type(app, "text/html").call(request)
      response[1]['Content-Type'].must_be_nil
    end
  end

  ['100', '204', '304'].each do |code|
    it "not set Content-Type on #{code} responses if status is a string" do
      app = lambda { |env| [code, {}, []] }
      response = content_type(app, "text/html").call(request)
      response[1]['Content-Type'].must_be_nil
    end
  end
end